Non-infectious cause: Lots of things can cause GI distress --infection (e.g. Giardia) or re-exposure with re-infection; maldigestion (pancreatic insufficiency) or malabsorption (celiac sprue); food intolerances with re-exposure to the offending substance (lactose, sorbitol, etc.), irritable bowel syndrome, missed diagnosis (incomplete evaluation), many viruses &bacteria. Zantac reduces acid-related gastritis symptoms.
Answered 9/27/2017
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